@jeffcliff With apologies, I don't accept bitcoin at present.

Rate depends on the level of detail you need. E.g. if you have maps already made and basic tectonics, and want to get a reality check/critique, that would be $50/h (one hour minimum).

If you want more in-depth help (e.g. creating a whole star system or planet with detailed climate zones, from scratch), that will be $75/h with a three hour minimum.

Of course, if you have specifics in mind, I'll provide a free estimate, so you know approximtely how many hours will go into your project.